This is just the basics, but anyone should be aware of it:
Budget: set it BEFORE you start gambling and stick to it.
Have a break from time to time, it is important to let your brain stop and consider.
Avoid drugs / drink as much as possible, they will make you loose some control innevitably.
Seek help if you feel you are no longer in control. Make a phone call to a friend or go out and speak with someone.
Anything else anyone can think of? Like... read this post before gambling?

Let the awareness of budgeting sink into minds of gamblers. Its a precursion that must be taken seriously. If a man recieves his wages or salary and walks into a casion with it, the only saving grace he has will be that information on budgeting else, he'll come out of the casino with an empty wallet. It has beome that bad, it is therefore necessary for advice to be given to gamblers